refactor: enforce ktx naming and AGENTS.md compliance sweep (#289)

Align the tree with AGENTS.md/CLAUDE.md conventions:

- Rewrite user-facing strings, docs, and tests to lowercase `ktx`
  (no bare uppercase `KTX` tokens remain outside literal identifiers).
- Drop the legacy `historicSql` migration path and its now-unused
  helpers, per the no-backward-compat rule.
- Remove `as unknown as` / `any` casts: narrow `BaseTool` generics to
  `z.ZodObject`, add a typed `createLookerClient`, and delete the dead
  `getParametersSchema`/`toAnthropicFormat` pre-AI-SDK helpers.
- Use `InvalidArgumentError` for Commander parse failures.
- Finish the adapter→connector prose conversion in the `ktx.yaml` docs
  while keeping the literal `adapters` config key.

scripts/conductor-scripts.test.mjs

@@ -42,7 +42,7 @@ describe('Conductor workspace scripts', () => {
     assert.doesNotMatch(workspaceScript, /link_agent_skills_for_claude/);
   });
 
-  it('runs the KTX daemon on the documented fixed local port', async () => {
+  it('runs the ktx daemon on the documented fixed local port', async () => {
     const runScript = await readText('scripts/conductor-run.sh');
 
     assert.match(runScript, /pnpm run build/);